boston marathon. but, again, as you heard him say, the one thing that he cannot understand out of this and no one that was not part of the attacks can understand is the mental component, how fficulit is to lose limb when someone purposefully and intentionally does something malicious like this. if you want to help any of the victims, any of the amputees or anyone here in boston, that was affected by this tragic attacks, go to cnn.com/impact. again, cnn.com/impact. we'll be right back. [ male announcer ] the 2013 chevy silverado 1500 has the best pickup coverage in america, with a new 2-year, 24,000-mile scheduled maintenance program, a 3-year, 36,000-mile bumper-to-bumper warranty, and a 5-year, 100,000-mile powertrain limited warranty. we've got you covered eight ways to sunday. come to think of it, sunday, too. right now chevy truck owners can trade up to a silverado all-star edition and get a total value of $8,500.